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    <!-- 题目1: 对字符串进行排列组合, 得到所有字符的全排列组合(假设所有字符不重复)
    函数名：permutation
    参数：需要排列组合的字符串
    返回值：字符串的所有排列组合数组
    例如：permutation("abc") 返回 ["abc", "acb", "bac", "bca", "cab", "cba"] 
-->
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<script>
    function permutation(str){
        let result = [];
        for(let i=0;i<str.length;i++){
            let c = str[i];
            let newstr = str.slice(0,i) + str.slice(i+1,str.length);
            return newstr;
        }
    }
    console.log(permutation("abc"));
</script>